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Hot Form Simulation Test on Desulphurization Pretreatment of Pig Iron Containing Boron

Author: LiuQi
Tutor: YangZhongDong
School: Northeastern University
Course: Environmental Science
Keywords: Boron-containing pig iron Hot metal pretreatment Hot metal desulphurization Desulfurizer
CLC: TF704.3
Type: Master's thesis
Year: 2008
Downloads: 27
Quote: 0
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Abstract


Boron an irreplaceable important role in the national economy and defense industry for further reasonable , the field of application of the value - added development of boron-containing pig iron , Northeastern University, the use of boron-containing pig iron smelting boron steel direction . Subject characteristics for the high sulfur content of the boron-containing pig iron , boron-containing pig iron desulphurization pretreatment thermal simulation test . The \For the high sulfur content of boron-containing pig iron , mainly through the injection of lime (CaO) based , calcium carbide (CaC2) based desulfurization agent, boron-containing pig iron pre- desulfurization , using scanning electron microscopy (SEM) impregnated with lime block desulfurization reaction layer were tested , and study of the desulfurization of the magnesium metal . The main conclusions are as follows : 1. Activity lime desulfurization When the the unit dosage greater than 20kg/tHM , the [S] content from about 0.1% to 0.01% , the desulfurization rate of 90% or more . 2 using calcium carbide desulfurization , desulfurization can reach 0.01 % of the requirements , when a unit dosage 6kg/tHM above , fast desulfurization , the desulfurization rate was above 90% . 3 the difference between calcium carbide and lime-based desulfurization calcium carbide desulfurization also has a deoxidizing effect , the oxygen activity test results show that the calcium carbide desulfurization , while also reducing the oxygen activity . The boron-containing pig iron to add Al , lime and calcium carbide desulfurization effect have been improved , the desulfurization speed control link CaO particles in the reaction layer diffusion of sulfur . 5 using SEM analysis on the active lime blocks immersed in the hot metal adding Al surface reaction level scanning showed that: the surface of the CaO particles are mainly generated calcium aluminate and calcium ferrite , under the 1400 ° C test temperature , they are molten liquid conducive to the diffusion of sulfur mass transfer .

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > General issues > Smelting process and operations > Desulfurization
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